(19)
(11) EP 2 259 569 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.03.2011 Bulletin 2011/11

(43) Date of publication A2:
08.12.2010 Bulletin 2010/49

(21) Application number: 10176144.3

(22) Date of filing: 19.10.2000
(51) International Patent Classification (IPC): 
H04N 5/235(2006.01)
H04N 5/353(2011.01)
 H04N 5/367(2011.01)
(84) Designated Contracting States:
AT BE CH DE ES FI FR GB IT LI NL SE

(30) Priority: 08.11.1999 JP 31665099
10.11.1999 JP 31960599
25.01.2000 JP 2000015981

(62) Application number of the earlier application in accordance with Art. 76 EPC:
00969899.4 / 1142314

(71) Applicant: Casio Computer Co., Ltd.
Tokyo 151-8543 (JP)

(72) Inventors:
  • Nakamura, Yoshiaki
    Hamura-shi, Tokyo 205-8555 (JP)
  • Koshizuka, Yasuo
    Fussa-shi, Tokyo 197-0003 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Photosensor system and drive control method thereof


(57) A photosensor system having a photosensor array constituted by two-dimensionally arraying a plurality of photosensors includes a driver circuit for supplying a drive signal to the photosensors, and a controller for controlling reading operation of a subject image and sensitivity setting. Before the start of normal reading operation of a subject image, prereading operation of changing the image reading sensitivity at a plurality of stages for respective rows is executed. A row in an optimal image reading state is easily determined based on the dynamic range distribution of the lightness data of read image data or a dynamic range distribution from which an abnormal value deviating from the main change trend of lightness data is removed, and the linearly differentiated value of the dynamic range. An image reading sensitivity set for this row is set as an optimal sensitivity. This can simplify sensitivity setting processing and shorten the required time.







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